npy文件格式記錄在numpy的https://github.com/numpy/numpy/blob/master/doc/neps/npy-format.rst中。
例如,代碼
>>> dt=numpy.dtype([('outer','(3,)<i4'),
... ('outer2',[('inner','(10,)<i4'),('inner2','f8')])])
>>> a=numpy.array([((1,2,3),((10,11,12,13,14,15,16,17,18,19),3.14)),
... ((4,5,6),((-1,-2,-3,-4,-5,-6,-7,-8,-9,-20),6.28))],dt)
>>> numpy.save('1.npy', a)
結果的文件中:
93 4E 55 4D 50 59 magic ("\x93NUMPY")
01 major version (1)
00 minor version (0)
96 00 HEADER_LEN (0x0096 = 150)
7B 27 64 65 73 63 72 27
3A 20 5B 28 27 6F 75 74
65 72 27 2C 20 27 3C 69
34 27 2C 20 28 33 2C 29
29 2C 20 28 27 6F 75 74
65 72 32 27 2C 20 5B 28
27 69 6E 6E 65 72 27 2C
20 27 3C 69 34 27 2C 20
28 31 30 2C 29 29 2C 20
28 27 69 6E 6E 65 72 32 Header, describing the data structure
27 2C 20 27 3C 66 38 27 "{'descr': [('outer', '<i4', (3,)),
29 5D 29 5D 2C 20 27 66 ('outer2', [
6F 72 74 72 61 6E 5F 6F ('inner', '<i4', (10,)),
72 64 65 72 27 3A 20 46 ('inner2', '<f8')]
61 6C 73 65 2C 20 27 73 )],
68 61 70 65 27 3A 20 28 'fortran_order': False,
32 2C 29 2C 20 7D 20 20 'shape': (2,), }"
20 20 20 20 20 20 20 20
20 20 20 20 20 0A
01 00 00 00 02 00 00 00 03 00 00 00 (1,2,3)
0A 00 00 00 0B 00 00 00 0C 00 00 00
0D 00 00 00 0E 00 00 00 0F 00 00 00
10 00 00 00 11 00 00 00 12 00 00 00
13 00 00 00 (10,11,12,13,14,15,16,17,18,19)
1F 85 EB 51 B8 1E 09 40 3.14
04 00 00 00 05 00 00 00 06 00 00 00 (4,5,6)
FF FF FF FF FE FF FF FF FD FF FF FF
FC FF FF FF FB FF FF FF FA FF FF FF
F9 FF FF FF F8 FF FF FF F7 FF FF FF
EC FF FF FF (-1,-2,-3,-4,-5,-6,-7,-8,-9,-20)
1F 85 EB 51 B8 1E 19 40 6.28
謝謝,這是最簡單的樣本 – 2010-11-03 18:20:27
那麼包含一些結構的數組的數組呢?在這種情況下數據的順序是什麼?在你的示例中,矩陣元素是按行存儲的,很明顯,我想知道numpy存儲複雜的數據 – 2010-11-03 18:22:23
@taras:查看更新。如果這個問題仍然不夠複雜,你應該編輯你的問題以顯示它的複雜程度(樣本數據)。 – kennytm 2010-11-03 18:35:34